Question

if one is the zero of the quadratic polynomial x square + k x minus 5 then find the value of k

Answer 1

put x= 1
x^2 +kx - 5=0
1+K-5=0
-4+k=0
k=4

Answer 2

x^2+kx-5
put x =1
then the expression will be zero
1+k-5=0
k=4